Device isn't compatible with this version?

I'm new here and also new to the Android OS. I have a Samsung Galaxy S6 and I want to download WatchON, for some apparent reason it won't allow me to download the app because "the device isn't compatible with this version".

Ironically I have a Peel Smart Remote that came pre-installed on the S6 however when I try to update the app, again a notification comes up saying the device isn't compatible with this version.

Can anyone advise me on how to solve this issue? Thanks And wow the S6 is an amazing device.